Article useful as booster chair and as step stool



FIG. 1 is a front perspective view of an article useful as a booster chair and as a step stool thereof;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a rear elevational view thereof; and,

FIG. 8 is a bottom plan view thereof. 

The ornamental design for an article useful as booster chair and as step stool, as shown and described. 